go: add «330. Patching Array»

Signed-off-by: Matej Focko <me@mfocko.xyz>

go/patching-array.go

@@ -0,0 +1,19 @@
+package main
+
+func minPatches(nums []int, n int) int {
+	missing := 1
+	patches := 0
+
+	i := 0
+	for missing <= n {
+		if i < len(nums) && nums[i] <= missing {
+			missing += nums[i]
+			i++
+		} else {
+			missing += missing
+			patches++
+		}
+	}
+
+	return patches
+}

go/patching-array_test.go

@@ -0,0 +1,22 @@
+package main
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_PatchingArray_Example1(t *testing.T) {
+	assert := assert.New(t)
+	assert.Equal(1, minPatches([]int{1, 3}, 6))
+}
+
+func Test_PatchingArray_Example2(t *testing.T) {
+	assert := assert.New(t)
+	assert.Equal(2, minPatches([]int{1, 5, 10}, 20))
+}
+
+func Test_PatchingArray_Example3(t *testing.T) {
+	assert := assert.New(t)
+	assert.Equal(0, minPatches([]int{1, 2, 2}, 5))
+}